Level too low -95dB - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 14 Old 01-12-17, 10:40 PM
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Re: Level too low -95dB

ASIO is the better choice for that setup in my opinion, but Java will work just fine also. We should be sure to avoid any red flashing on the Solo input as that means the signal is being clipped. A setting of 12:00 O'clock on the Solo input gain as shown in Post 3 is okay. A setting between 12 and 3 O'clock is a good setting for the Solo. The reported headroom of -22 dB during a measurement is good also. It's pretty normal to take measurements with the measurement headroom reported somewhere between -28 to -18 dB.
If the REW SPL meter is calibrated per the REW Help instructions the REW charts will show the correct SPL level. If the REW SPL meter is not calibrated then the SPL level on the charts may be shifted higher or lower than actual, but the shape of the curve is still correct and the data is useful. Be careful if the REW SPL meter calibration has not been done - a low reading on the chart may occur when the actual level is much higher! That may be the current situation.
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post #12 of 14 Old 01-13-17, 12:55 AM Thread Starter
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Re: Level too low -95dB

Quote:
jtalden wrote: View Post
ASIO is the better choice for that setup in my opinion, but Java will work just fine also. We should be sure to avoid any red flashing on the Solo input as that means the signal is being clipped. A setting of 12:00 O'clock on the Solo input gain as shown in Post 3 is okay. A setting between 12 and 3 O'clock is a good setting for the Solo. The reported headroom of -22 dB during a measurement is good also. It's pretty normal to take measurements with the measurement headroom reported somewhere between -28 to -18 dB.
If the REW SPL meter is calibrated per the REW Help instructions the REW charts will show the correct SPL level. If the REW SPL meter is not calibrated then the SPL level on the charts may be shifted higher or lower than actual, but the shape of the curve is still correct and the data is useful. Be careful if the REW SPL meter calibration has not been done - a low reading on the chart may occur when the actual level is much higher! That may be the current situation.
Hi mate,

Just so we are on the same page I have included the following photos for clarity.

The first photo refers to CHECK LEVEL. The reading comes up as -22dB as depicted.

Are you saying this is a headroom check. I was of the understanding when you check level that it would be 75dB as a result. Am I wrong here?

The second photo refers to START MEASURING which is the button next to check level.

In that photo it shows a Headroom figure of 10.5dB.

The photo after that is a graph that comes right after that figure.

Are these results okay in your opinion for me to now to do a SPL calibration?

Cheers and thankyou.
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post #13 of 14 Old 01-13-17, 07:47 AM
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Re: Level too low -95dB

Sorry Ozzie

I had to dash to work ( & therefore left you hanging / aren't forums just grand ? ) .

I was hoping the clues given within my first posts (to your input dilemma) would allow you to "puzzle-out the solution" ( & so give to you the satisfaction of arriving at your own "a-ha moment" ) .

Clearly John ( ie; jtalden ) saw you struggling & offered the solution on a platter ( which still managed to give you pause ).

FYI, REW is pretty complicated software, and its made more so by combining it's steep learning curve with first use of a soundcard ( that's not a recommended situation by me if at all avoidable ).

Quote:
Ozzie wrote:
Are these results okay in your opinion for me to now to do a SPL calibration?
Yes your REW output & record levels are fine and you can move onto the next step of setting up REW's SPL Meter.



Last edited by EarlK; 01-13-17 at 09:17 AM.
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post #14 of 14 Old 01-14-17, 02:02 PM Thread Starter
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Re: Level too low -95dB

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EarlK wrote: View Post
Sorry Ozzie

I had to dash to work ( & therefore left you hanging / aren't forums just grand ? ) .

I was hoping the clues given within my first posts (to your input dilemma) would allow you to "puzzle-out the solution" ( & so give to you the satisfaction of arriving at your own "a-ha moment" ) .

Clearly John ( ie; jtalden ) saw you struggling & offered the solution on a platter ( which still managed to give you pause ).

FYI, REW is pretty complicated software, and its made more so by combining it's steep learning curve with first use of a soundcard ( that's not a recommended situation by me if at all avoidable ).



Yes your REW output & record levels are fine and you can move onto the next step of setting up REW's SPL Meter.


Thankyou.

I appreciate all the support one can get.
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